The latest rose leaf blight control methods
Leaf blight is one of the common diseases of rose. The infected rose will first appear disease spots from the top or edge of the leaves. With the occurrence of the disease, the disease spots will be irregular from small to large, and the color will be from reddish brown to grayish brown. Finally, the disease spots will become large blight spots. If the disease is serious, it will cause the death of rose plants. Let's take a look at the prevention and control methods of rose leaf blight.
Harmful symptoms
Rose leaf blight often causes the leaves of nursery and potted roses to dry and fall off, and the pathogen often invades from the leaf tip or leaf edge, which is a small yellow spot at first, then rapidly expands inward into irregular spots, and the seriously damaged whole leaf dries up to 2pm 3, the diseased part is chlorotic and yellowing, brown withered off, and sometimes the surface of the leaves are sparse black dots.
Occurrence regularity
The pathogen of leaf blight belongs to the order Coleophora, and the small black spots on the leaves are the conidia of the pathogen. The conidium is spherical or subspherical, light brown, with a hole at the top, initially buried in the leaf tissue, then breaks through the epidermis and produces many conidia for infection. The disease was severe in high temperature and high humidity from July to September.
Prevention and cure method
1. Agricultural prevention and control: remove diseased leaves on the ground and underground, and eliminate overwintering pathogens. If the diseased leaves are removed in time during the onset of the disease, the spread of the disease can be effectively controlled.
2. Drug control: spray 75% chlorothalonil 600 times 800 times or 25% carbendazim 500 times during the onset of the disease.
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